You can't really control how marble is going to look, can you? It's not like a tye dye shirt where you have some idea of what you're going to get. If the marble comes out looking like shit, literally, then it's just going to look like shit. You still have to sell it though. Who lets good marble go to waste? Not me. I'd lose my marbles! That's a dumb joke, but think about it, do you even really deserve a good joke?
I can definitely tell you that I've seen a white marble bathroom that looked like this before. It was at a party, and a girl was the culprit. I don't know what happened, because she never gave anyone a clear story, but she went in and it was clean. She left and it looked like a version of that. Ten days later we were married.